Pyrite is often called fool's gold, but it's easy to tell the two apart if you know what to look for. Learn more about these two minerals in today's episode of BrainStuff.
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BrainStuff Classics: Why Are Some Americans Cancelling Columbus Day?
07:16

American Versus British English: What Are Biscuits, Muffins, and Pudding?
09:51

How Do Sunspots Work?
14:22